Dissolution characteristics of black aluminum dross in Na_(3)AIF_(6)-AIF_(3)-Al_(2)O_(3)molten salt system  

作　　者：Zheng-Ping Zuo Guo-Qing Yu Chun-Li Liu Gui-Cheng Liu Feng-Qin Liu 

机构地区：[1]State Key Laboratory of Advanced Metallurgy,School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing 100083,China [2]Research Center Heavy Machinery Ministry of Education,Taiyuan University of Science and Technology,Taiyuan 030024,China [3]Department of Physics and Oxide Research Center,Hankuk University of Foreign Studies,Yongin 17035,Republic of Korea [4]School of Energy Power and Mechanical Engineering,North China Electric Power University,Beijing 102206,China [5]Department of Physics,Dongguk University,Seoul 04620,Korea

出　　处：《Rare Metals》2023年第8期2747-2756,共10页稀有金属（英文版）

基　　金：financially supported by the National Key Research and Development Program of China(No.2019YFC1908403);the National Research Foundation from the government of the Republic of Korea(Nos.2022K1A3A1A20014496 and 2022R1F1A1074707)。

摘　　要：The dissolution performance of black aluminum dross(BAD)in cryolite electrolyte is key to its recovery by molten salt electrolysis.The stable operation of the electrolyzer depends mainly on the rapid dissolution of BAD in Na_(3)AlF_(6)-AlF_(3)-Al_(2)O_(3)electrolyte system.In this paper,the dissolution performance and behavior of BAD and its main components in the cryolite system were studied,and the saturation solubility of aluminum nitride in this system was determined.The dissolution performance of BAD in cryolite electrolyte before and after denitration was compared,and the effects of temperature,cryolite ratio,and the doping ratio of BAD and alumina on the dissolution rate were investigated.The obtained results showed that aluminum nitride was the main factor affecting the dissolution performance of BAD in the electrolyte.Aluminum nitride was partly converted toα-Al_(2)O_(3)after addition to the electrolyte,and the convertedα-Al_(2)O_(3)was partially dissolved in the cryolite electrolyte,while the remaining precipitated and accumulated at the bottom with aluminum nitride.Aluminum nitride was almost insoluble in the cryolite electrolyte,with 0.0022%solubility.A higher proportion ofα-Al_(2)O_(3)in BAD was negatively influenced its solubility in the cryolite electrolyte.The dissolution rate of BAD in cryolite electrolytes was effectively improved by mixing BAD withγ-Al_(2)O_(3).

关 键 词：Aluminum dross Aluminum nitride KINETICS HYDROLYSIS Dissolution rate 

分 类 号：X75[环境科学与工程—环境工程] TF821[冶金工程—有色金属冶金]